Pressure-transmitter.



No. 658,220. Patented Sept. I8, |900. L. L. PRESCUTT.

PRESSURE TRANSMITTER.

(Application led June 4, 1900.)

(No Model.)

NTTED STATES PATENT OFFICE.

LOREN LOCKE PRESCOTT, OF MARINETTE, WISCONSIN.

PRESSURE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 658,220, datedSeptember 18, 1900.

Application filed J une 4, 19,00.

.To all whom t may carl/cern.- A

Be it known that I, LoRnNLooxn PRES- COTT, a citizen of the UnitedStates, and a resident of Marinette, county of Marinette and State ofWisconsin, have invented certain new and useful Improvements inPressure-Transmitters, of which the following is a specification, andwhich are illustrated in the accompanying drawings, forming a partthereof.

This invention relates to that type of transmitters forming a connectionbetween a stationary source of Huid-pressure and a movable motor-nas,for example, in transmitting steam-pressure to a motor mounted upon asawmill-carriage.

The objects of the invention are to simplify and cheapen theconstruction of such connections and to increase their eiiciency anddurability.

The invention consists in the structure hereinafter fully described, andillustrated in the accompanying drawings, in which'- Figure 1 is adetail side elevation of the transmitter, a sawmill-carriage beingconventionally shown. Fig. 2 is a d etail section on the line 2 2 ofFig. 1, and Fig. 3 isacrosssectionl on the line 3 3 of Fig. 2.

For the purpose of more clearlyindicating the situation in which thedevice forming the subject of the application is intended to be usedthere is shown in the drawings the outline of a sawmill-carriage 10 andof a steam-motor 11, mounted thereon. At 12 and 13 there are shown,respectively, the steam service and exhaust'pipes leading to and fromthe motor 11, these pipes connecting, respectively,with pipes 14 and 15,telescopically entering fixed pipes 16 and 17, mounted upon suitablebrackets rising from the floor 18. lead to any suitable place ofdischarge for the exhaust-steam and needs no further description thanthat the hereinafter-described form of construction of the service sideof the transmitter is followed in the exhaust side, so far as relates tothe construction of the pipes 15 and 17, except that the end of thelatter may be open. The outer end of the pipe 16 is closed, and at itsinner end it is provided with a suitable stufling-box 19, through whichthe pipe 14 enters. A steam-pipe 20 enters the The pipe 17 mayv .SerialNo. 19.057. tNo modelo pipe 16 at any desired point. As shown, it islocated near the inner end ot' this pipe. The

pipe'l is of greater internal diameterthan the external diameter of thepipe 14, so that the surfaces of the two are not in frictionalengagement. The former pipe is composed of a plurality of com paratively-short sections, as 2l 22, adjacent sections being united bycouplings, asv 23, having their ends internally screwthreaded forengagement with the pi pesections and angular impress-section for theapplication thereto of the wrench. mediate of their ends the couplings23 are somewhat contracted, so as to form bearings .for the pipe 14, andpreferably they are provided with bushings 24, of antifriction metal,and each with a by-pass 25, extending longitudinally through the wall ofthe contracted portion, so as to allow the free transmission lof steamfrom one section of the pipe 16 to the next; By` making the bore of thecoupling 23 suiiciently large the steam may pass by the pipe 14, and theby-pass 25 may be dispensed with.

The end of the pipe 14 is open, and preferably the pipe-is provided witha plurality of apertures 27 near its end, so that the steam may freelyeter it. The bore of the coupling 23 at its inner end-that is to say,the end toward the stuffing-box lil-preferably tapers inwardly, as shownat 28, so that as the pipe 14 advances its end will be guided to thebearing portion of the connection by the gentle incline of the wall atits inner end, and to avoid friction the extreme end of the pipe 26 ispreferably somewhat contracted, as shown at 29, so that that portionwhich comes in contact with the inclined wall of the connection isitself inclined.

Heretofore in transmitters of this type the two telescoping. tubes havebeen made to fit closely together throughout their entire lengths, andhence it has been necessary to carefully machine both the exterior ofthe inner pipe and the interior of the outer pipe. This has been anexpensive operation and one diflicult to perform, and, furthermore, anyaccident which might slightly b end the outer tube would incapacitatethe entire device. The friction of the two long bearings has beenexcessive and of course the wear Iuter- IOO Very great, and it has beennecessary to connect the steam-pipe leading from the boiler with theextreme end of the stationary pipe. ln the construction hereinbeforedescribed it becomes unnecessary to dress out the interior of theexternal tube, and ample space is provided for the circulation of thesteam throughout the entire length of this pipe, so that the steam maybe led to it at any point where the connection can be most convenientlymade. The couplings 23 provide convenient means for carrying theantifrictionbearings, and these may be easily replaced from time totime, if necessary. The Wear will of course be at the lower side of thebearing, and this may be readily distributed by slightly turning theconnection from time to time.

The by-pass 25 may be at the bottom, as shown in Fig. 2, or at the side,as shown in Fig. 3, or in any other position.

I claim as my inventionl. In a connection between a stationary source offluid-pressure and a movable fluidm otor,incombination,telescopically-engaged pipes of such relative size thattheir surfaces are out of frictional contact, the outer pipe beingprovided at intervals with annular bearing-blocks for carrying the innerpipe, such block being adapted to allow the passage of fluid.

2. In a connection between a stationary source of Huid-pressure and amovable fluidmotor,in combination,telescopical1y-engaged pipes of suchrelative size that their surfaces are out of frictional contact, theouter pipe being composed of sections, a coupling for uniting theadjacent sections and being contracted intermediate of its ends toprovide bearings for the inner pipe.

3. In a connection between a stationary source of fluid-pressure and amovable iluidmotor,in combination,telescopically-engaged pipes of suchrelative size that their surfaces are out of frictional contact, theouter pipe being composed of sections, a coupling for uniting theadjacent sections, and a bushing of antifriction metal within eachcoupling to serve as a bearing for the inner pipe.

4. In a connection between a stationary source of Huid-pressure and amovable fiuidmotor,in combination,telescopicallyengaged pipes of suchrelative size that their surfaces are out of frictional contact, theouter pipe being composed of sections, a coupling for uniting theadjacent sections and being contracted intermediate of its ends toprovide bearings for the inner pipe, and having a bypass longitudinallythrough the wall of the contracted portion.

5. In a connection between a stationary source of duid-pressure and amovable iiuidmotor,in combination,telescopically-engaged pipes of suchrelative size that their surfaces are out of frictional contact, theouter pipe being composed of sections, a coupling 'for uniting theadjacent sections and being contracted intermediate of its ends toprovide bearings for the inner pipe, the bore of the coupling beingtapering at one end for the purpose specified.

LOREN LO CKE PRESCOTT.

Witnesses:

SUMNER K. PREsooTT, S. C. ELLIS.

